/SPRING
Block Format Keyword Defines a spring element. It is used for modeling connection. The spring properties are applied to the local spring coordinate system.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| /SPRING/part_ID | |||||||||
| sprg_ID | node_ID1 | node_ID2 | node_ID3 | node_ID4 | node_ID5 | node_ID6 | Skew_ID | ||
Definition
| Field | Contents | SI Unit Example |
|---|---|---|
| part_ID | Part identifier of the
block. (Integer, maximum 10 digits) |
|
| sprg_ID | Element
identifier. (Integer) |
|
| node_ID1 | Node identifier 1 for
spring. (Integer) |
|
| node_ID2 | Node identifier 2 for
spring. (Integer) |
|
| node_ID3 | Node
identifier 3. (Integer) |
|
| node_ID4 | Node
identifier 4. (Integer) |
|
| node_ID5 | Node
identifier 5. (Integer) |
|
| node_ID6 | Node
identifier 6. (Integer) |
|
| Skew_ID | Optional: Skew system
identifier. Only used when the spring is defined using /PROP/TYPE8 (SPR_GENE) or /PROP/SPR_MAT (TYPE23) with /MAT/LAW108 (SPR_GEN). 8 (Integer) |
Comments
- The identifier must be unique in each element family, but it is advised for each element type to have a unique element identifier in the global model.
- More than one spring block can be used to define a part.
- Any number of springs can be defined in one block.
- Spring elements with /PROP/TYPE8 (SPR_GENE) or /PROP/TYPE23 (SPR_MAT) with /MAT/LAW108 (SPR_GENE) may have a length equal to 0.
- Spring elements with /PROP/TYPE12 (SPR_PUL), /PROP/TYPE13 (SPR_BEAM), /PROP/TYPE23 (SPR_MAT) and /PROP/TYPE13 (SPR_BEAM) with /MAT/LAW113 (SPR_BEAM) should have a non-zero length.
- Spring element is defined with two
nodes: node_ID1 and node_ID2.The plane XY is defined with the three nodes (node_ID1, node_ID2, and node_ID3); the third node, node_ID3 defines the Y direction also for the non-symmetric spring (/PROP/TYPE13 or /MAT/LAW113).
Figure 1. - Both node_ID5 and node_ID6 are reserved for future use for new joints types.
- For spring elements using /PROP/TYPE8 (SPR_GENE) or /PROP/SPR_MAT with /MAT/LAW108, the local system can be defined for each element using /SPRING Skew_ID. If Skew_ID is not defined for each element, the local system defined in /PROP/TYPE8 (SPR_GENE) or /PROP/TYPE23 (SPR_MAT) Skew_ID is used. If a system is not defined in the element or property, then the global system is used.